Abstract : Titanium coatings cause a change in the plasticity of molybdenum. The character and degree of the effect of coatings depend on the thickness of the coating, the conditions of annealing and other factors. Titanium films up to 1 mu m cause an increase of relative elongation of molybdenum after annealing in the temperature range 450-1100 degrees centigrade. Films 10 mu m thick and more increase the plasticity of molybdenum if the annealing temperature after coating does not exceed 700 degrees centigrade, and they cause embrittlement after annealing above 800 degrees centigrade. The mechanism of the effect of titanium coatings on the plastic properties of molybdenum is discussed. (Author)